The Eiffel Tower is a very difficult print to make, primarily because it has so many small, slanted parts. The most difficult area to print are all the support trusses holding up the first level deck, and the platform railings which are very thin. I wa
s able to make a pretty good print after changing someprinter parameters -
http://birkbinnard.com/blog/eiffel-tower/
is a blog page that explains what did.
Stringing is the biggest problem I had with this print (and many others as well), but I have recently done a very clean string test print using the latest version of the Plic3r slicer. This is the Prusa version of Slic3r and it is now my slicer of choice.